CN108699613A - The manufacturing method of molten steel - Google Patents
The manufacturing method of molten steel Download PDFInfo
- Publication number
- CN108699613A CN108699613A CN201780013618.3A CN201780013618A CN108699613A CN 108699613 A CN108699613 A CN 108699613A CN 201780013618 A CN201780013618 A CN 201780013618A CN 108699613 A CN108699613 A CN 108699613A
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- CN
- China
- Prior art keywords
- clinker
- furnace
- slag
- decarburization
- decarbonizing
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
In the state of so that a part for the clinker generated by previous furnace charge is remained in decarbonizing furnace, in this furnace charge, clinker is put into the decarbonizing furnace obtained from making the clinker solidification generated by past decarburization blowing, then, phosphorus concentration is encased in less than the iron liquid of 0.060 mass % in the decarbonizing furnace and carries out decarburization blowing.In addition, in this furnace charge by decarburization blowing generate clinker in P2O5A concentration of specified value it is below in the case of, a part is remained in the decarbonizing furnace as the clinker that uses in next time furnace charge.
Description
Technical field
The present invention is more particularly directed to the suitable steel used to cut down the amount of the fluxing agent added when decarburization is blown
The manufacturing method of liquid.
Background technology
In the past, it was blown to iron liquid with decarbonizing furnace in order to be reduced to the phosphorus concentration of required product specifications or less
When manufacturing molten steel, fluxing agent is put into from the feeding groove being set in converter.Iron of the fluxing agent put into iron liquid in high temperature
Liquid surface melts, and is formed with CaO and SiO2Clinker as main body.In turn, in blowing via main jet rifle into iron liquid
It is blown into pure oxygen, the phosphorus in iron liquid becomes phosphorous oxides, forms solid solution with the CaO in clinker, is removed in clinker.As a result,
Phosphorus concentration in iron liquid declines.The amount of input fluxing agent is according to the pretreated iron liquid ingredient of iron liquid, the phosphorus of product specifications
Concentration and target temperature determine, but in recent years, high-endization of steel product and the severization of user specification are developed, in order to
Phosphorus concentration is set further to decline, the amount of fluxing agent, which exists to increase, to be inclined to.
Then, in order to reduce cost in steel making working procedure, as the method for the amount for cutting down the fluxing agent newly put into, there is clinker
Recycling process.In slag recycle method, there are cold recycling and heat to recycle this 2 kinds of methods.In the following description, fluxing agent
Refer to the slag material imported outside the system of slag recycle, not comprising the clinker being recycled.
Cold recycling is the technology being widely used in the convection current such as SRP methods refining all the time, in patent document 1 and 2
In disclose the technology of cold recycling.In general, in cold recycling, from decarburization furnace slag discharge to slag ladle in clinker (it is following,
Decarburization clinker) it is carried after the cooling period to steel-making factory via processes such as magnetic separation, broken, whole grains.Then, the decarburization that will be carried
Clinker is recycled to as black furnace slag in dephosphorization stove.
On the other hand, the heat recycling mainly technology that is used in MURC methods, for example, in patent document 3 and 4 it is public
It opens.In heat recycles, the feature for alternately implementing dephosphorization blowing and decarburization blowing with same converter is utilized, after decarburization tapping
So that hot stove slag is remained in stove, so that hot stove slag is solidified to the journey that can fill iron liquid by putting into waste material in next furnace charge
Degree carries out filling iron liquid and the dephosphorization blowing of next furnace charge.It so, can be while omitting the slag treatment outside process
Clinker is remained for the dephosphorization blowing of next furnace charge.
As described above, no matter which kind of method is all by the decarburization clinker of high alkalinity to the basicity dephosphorization stove lower than decarbonizing furnace
The middle method recycled, but clinker can also be recycled into decarbonizing furnace.Thereby, it is possible to reducing in dephosphorization stove or
The amount of the fluxing agent newly put into decarbonizing furnace.
In addition, Patent Document 5 discloses a kind of technologies, it can be according to P in deslagging in decarbonizing furnace2O5Concentration pair
Decarburization clinker carries out difference recycling, and according to steel grade and by best P2O5The decarburization clinker of concentration carries out cold recycling or heat again
Cycle, but it does not disclose that the method for cold recycling is used when the clinker for making heat recycle solidifies.In addition, such as patent document 5
Like that, P when according only to deslagging2O5In the case that decarburization clinker is carried out cold recycling or heat recycling by concentration, there is also
Following projects:If the high iron liquid of phosphorus concentration is fitted into decarbonizing furnace, the P in clinker2O5Concentration is always got higher, entirely without
Method implements heat recycling.
In addition, in the case where implementing cold recycling, black furnace slag is worried due to more than meal component and being easy to include moisture
Reactivity when converter is put into is big, and larger load can be caused to discharge duct and dust filter cloth etc..Thus, in cold recycling
In, it is difficult to it is recycled in large quantities with decarbonizing furnace.
On the other hand, the operation without using waste material is carried out in decarbonizing furnace.Accordingly, there exist following projects:With decarbonizing furnace
In the case of implementing heat recycling, the solidification of hot stove slag will not be carried out fully, it is therefore desirable to newly-increased to use fluxing agent etc. as cold
But agent will not carry out an adequate amount of heat recycling without using coolant.
In turn, interior in slag recycle to have because of the P in clinker2O5The undesirable misgivings of dephosphorization caused by concentration.Cold
In recycling, since the constituent analysis of decarburization clinker can be carried out, the method described in patent document 5, Neng Gougen are used
According to P2O5Concentration to carry out difference recycling, and clinker is selected according to steel grade.But in heat recycles, due to being continuously
Decarburization clinker is recycled, therefore the constituent analysis of decarburization clinker is impossible, P2O5Concentration degree it is unclear.Cause
This, only can be by P2O5Concentration can extremely avoid the undesirable degree of dephosphorization at leisure, therefore carry out an adequate amount of heat there is also no
The project of recycling.
Existing technical literature
Patent document
Patent document 1:Japanese Unexamined Patent Publication 4-120209 bulletins
Patent document 2:Japanese Unexamined Patent Application 64-75618 bulletins
Patent document 3:No. 2607328 bulletins of Japanese Patent No.
Patent document 4:No. 5671801 bulletins of Japanese Patent No.
Patent document 5:No. 3829696 bulletins of Japanese Patent No.
Non-patent literature
Non-patent literature 1:Material and technique Vol.8 (1995), p.183
Invention content
Problems to be solved by the invention
The present invention is in view of the above-mentioned problems, it is therefore an objective to which the fluxing agent newly put into decarburization blowing can fully be reduced by providing
The manufacturing method of the molten steel of amount.
Means for solving the problems
The present invention is as described below.
(1) a kind of manufacturing method of molten steel, which is characterized in that in the part residual for the clinker for making to be generated by previous furnace charge
In the state of in decarbonizing furnace, in this furnace charge, stove obtained from the clinker solidification generated by past decarburization blowing will be made
Slag is put into the decarbonizing furnace, then, by phosphorus concentration be encased in the decarbonizing furnace less than the iron liquid of 0.060 mass % and into
Row decarburization is blown.
(2) manufacturing method of the molten steel according to above-mentioned (1), which is characterized in that being blown by decarburization in this furnace charge
Refine the P in the clinker generated2O5A concentration of specified value it is below in the case of, a part is remained in into conduct in the decarbonizing furnace
The clinker used in next furnace charge.
(3) manufacturing method of the molten steel according to above-mentioned (1) or (2), which is characterized in that in this furnace charge, by institute
Clinker is put into the decarbonizing furnace obtained from stating solidification, and puts into fluxing agent,
Wherein, the amount of the fluxing agent is based on the P in the clinker generated by previous furnace charge2O5Concentration determine.
(4) manufacturing method of the molten steel according to any one of above-mentioned (1)~(3), which is characterized in that it is described solidification and
The grain size of obtained clinker is 50mm or less.
Invention effect
In accordance with the invention it is possible to provide the system of the molten steel for the amount that can fully reduce the fluxing agent newly put into decarburization blowing
Make method.
Description of the drawings
Fig. 1 is the detailed figure for the composition for indicating the decarburization clinker in Examples 1 to 4 and comparative example.
Fig. 2 is to indicate the [ from the molten steel tapped in the decarbonizing furnace in Examples 1 to 6 and comparative example;P]Figure.
Fig. 3 is the (P indicated in hot stove slag2O5) with tapping after molten steel in [P]Relationship figure.
Fig. 4 is the detailed figure for the composition for indicating the decarburization clinker in embodiment 1,5,6.
Specific implementation mode
Hereinafter, detailed description of embodiments of the present invention.Hereinafter, the Fu Hao [ being attached on the symbol of element;]Indicating should
Concentration of the element in iron liquid or molten steel, the symbol () being attached in the symbol of element or compound indicate that the element or compound exist
Concentration in clinker.
In the present invention, for the dephosphorization treatment that will be pre-processed or be carried out in dephosphorization stove by the iron liquid carried out other than converter
Deng and clinker that while carrying out decarburization blowing in decarbonizing furnace by the iron liquid of dephosphorization is generated, be recycled for cold recycling and heat
It is used in combination, carries out decarburization blowing using the black furnace slag generated by cold recycling and the hot stove slag generated by heat recycling, make
[ in molten steel;P]Decline.
In cold recycling, by molten steel from decarbonizing furnace tap after by decarburization clinker into slag ladle deslagging, by institute's deslagging
It is crushed after decarburization cooling of furnace slag, is sieved and is adjusted to defined grain size, obtain black furnace slag.Then, after a couple of days
In furnace charge, black furnace slag is put into from the feeding groove being set on decarbonizing furnace into decarbonizing furnace.For present embodiment, generate not
It is the black furnace slag for using in dephosphorization stove but being used in decarbonizing furnace.
In heat recycles, by molten steel not by clinker deslagging after tapping in decarbonizing furnace, but make the decarbonizing furnace of high temperature
Slag (hot stove slag) remains in decarbonizing furnace, puts into high fluxing agent of cooling effect etc. and makes its solidification.Later, next furnace charge is injected
Iron liquid, be transferred to decarburization blowing.
In present embodiment, first, black furnace slag is generated in advance by cold recycling.Then, raw in making previous furnace charge
At hot stove slag remain in decarbonizing furnace in the state of, in this furnace charge, hot stove slag there are in the state of put into black furnace slag,
Fluxing agent is further put into the case that slag amount is insufficient, iron liquid is packed into later and carries out decarburization blowing.Then, preferably
It is to predict (the P in clinker in advance in this furnace charge2O5), judge that the decarburization clinker generated in this furnace charge could be to next stove
It is recycled in material.In the case where being judged to recycle, so that a part for decarburization clinker is remained in decarbonizing furnace and be used as down
The hot stove slag of secondary furnace charge.Hereinafter, job step is described in detail.
First, a part for the decarburization clinker that will be generated by the decarburization of previous furnace charge blowing remains in decarbonizing furnace.It should
Decarburization clinker is the clinker for being judged as to recycle by the judgement of recycling.For recycling judgement it is detailed in
Appearance can be described below.Then, in this furnace charge, iron liquid, black furnace slag and fluxing agent are put into decarbonizing furnace, carry out decarburization
Blowing.
Put into [ in the iron liquid in decarbonizing furnace;P]It is set at less than 0.060 mass %.By [ in iron liquid;P]It is set as
It is less than the reasons why 0.060 mass %:If [ in iron liquid;P]For 0.060 mass % or more, then need to increase dephosphorization amount, stove
(P in slag2O5) can get higher, it becomes unsuitable for as the clinker being recycled in decarbonizing furnace.It is preferred that putting into the iron in decarbonizing furnace
[ in liquid;P]For 0.035 mass % or less.In general, the [ from the iron liquid in blast furnace out;P]For more than 0.100 matter
The degree of % is measured, but for making [ in iron liquid;P]It is not particularly limited as the method less than 0.060 mass %.Such as also may be used
To make [ in iron liquid by the dephosphorization treatment in dephosphorization stove;P]As less than 0.060 mass %, alternatively, it is also possible to by answering
Make [ in iron liquid with well-known iron liquid preconditioning technique;P]Easily become and is less than 0.060 mass %.
In decarburization blowing, according to the molten steel [ as target;P]And [ after dephosphorization treatment;P]To determine necessary phosphorus distribution
Than thus calculating necessary slag amount.In addition, in decarburization blowing, basicity is set as 3.6~3.8, out of protection melting furnace
From the perspective of refractory material, (MgO) in clinker is set as 6~9 mass %.Based on these conditions, in that case it can be decided that fluxing agent
Input amount.
Here, phosphor partition ratio is value ((P)/[ obtained from the phosphorus concentration in the phosphorus concentration divided by molten steel in clinker;P]), it must
It is 30~60 or so range to want phosphor partition ratio, in the molten steel [ as target;P]In the case of small, necessary phosphorus apportionment ratio is set
It is set to big value.Since the molten steel amount gone out can be predicted in advance, so if phosphor partition ratio can be set, then can calculate must
Want slag amount.
On the other hand, it was recently reported that:Phosphor partition ratio in decarbonizing furnace various slag compositions and outlet temperature is related (such as joins
According to non-patent literature 1).Therefore, according to the side of (MgO) and above-mentioned correlation that disclosure satisfy that in necessary slag amount, basicity, clinker
Formula determines the combination of a variety of fluxing agents.It should be noted that the determining method of the combination of fluxing agent not without exception depending on, but
Consider the local conditionals such as easiness, the cost that the operation experience in each stove, fluxing agent are buied to determine.Kind as fluxing agent
Class can enumerate quick lime, dolomite, silica, peridotite, light dolomite etc..In the case of quick lime, preferable particle size is
3~10mm, in the case of light dolomite, preferable particle size is 5~30mm.
In addition, since being tapped previous furnace charge in this furnace charge until the input of iron liquid during, will be cold
Clinker is put into decarbonizing furnace.It is in the reasons why this period putting into black furnace slag:In order to keep the hot stove slag generated in previous furnace charge solid
Change;In addition also for prevent because input black furnace slag caused by bumping react.If putting into black furnace slag, black furnace in this period
Moisture in slag can be removed by hot stove slag.Here, it when generating black furnace slag, is preferably sieved and grain size is adjusted to 50mm or less.
The reason that the grain size of black furnace slag is set to 50mm or less be due to:It is easy in storage to the hopper in melting furnace, and then is easy
Black furnace slag is put into from hopper into decarbonizing furnace, scorification can be successfully carried out in decarbonizing furnace.On the other hand, if black furnace slag
Grain size be more than 50mm, there will be following possibilities:Generate with to hopper conveyance, cut out and (transport) etc. caused by processing
Failure;In decarbonizing furnace, heat transfer and scorification need many time.Alternatively, it is also possible to put into work together with black furnace slag, fluxing agent
For the oxide skin of the coolant of temperature adjustment.
If putting into iron liquid, black furnace slag and fluxing agent in decarbonizing furnace as described above, it can be blown into oxygen from main jet rifle,
Start decarburization blowing.Then, if reaching reach [C], then molten steel from decarbonizing furnace to casting ladle tap.For decarburization clinker, directly
It connects and remains in decarbonizing furnace as hot stove slag.At this point, can also be according to (the P in decarburization clinker2O5) come determine whether carry out heat again
Cycle.
In the case where implementing heat recycling, dephosphorization is carried out with using the clinker generated by the fluxing agent newly put into
Situation is compared, (the P in clinker2O5) concentration.If (P2O5) excessive concentration, then the dephosphorizing capacity of clinker decline.Therefore, also may be used
To predict (the P in clinker in advance2O5) come determine whether can by the decarburization clinker generated in this furnace charge downwards secondary furnace charge again
Cycle.(P in clinker2O5) predicted according to the mass balance equation of phosphorus shown in formula below (1)~formula (3).
(P in clinker2O5) (P in (quality %)=clinker2O5) (kg/t) ÷ slag amounts (kg/t) × 100
(1)
(P in clinker2O5) (kg/t)=(P is left in clinker2O5) (P in (kg/t)+black furnace slag2O5) (kg/t)+this stove
Expect (P in clinker2O5) (P in (kg/t)+previous furnace charge hot stove slag2O5)(kg/t)
(2)
Slag amount (kg/t)=leave slag amount (kg/t)+black furnace quantity of slag (kg/t)+this furnace charge slag amount (kg/t)+preceding
The secondary furnace charge hot stove quantity of slag (kg/t) (3)
Here, it refers to the clinker with iron liquid from preceding process " to leave clinker ", and amount can pass through slag composition
Mass balance investigation result hold." this furnace charge clinker " refers to the clinker for coming from fluxing agent.
" previous furnace charge hot stove slag " is not by the decarbonizing furnace generated in the previous furnace charge of the last time of this furnace charge
The complete deslagging of slag and by remaining in the hot stove slag being recycled in stove, amount passes through the final turning angle of converter when deslagging
It determines, therefore can hold.With regard to (P in previous furnace charge hot stove slag2O5) for (kg/t), although being difficult to directly carry out sample
Constituent analysis, but (P in clinker can be calculated by formula (1) in previous furnace charge2O5) (quality %), therefore can hold.
(the P in clinker as described above2O5) (quality %) be specified value it is below in the case of, by decarburization clinker carry out portion
Divide deslagging and implement hot recycling, in next furnace charge, calculates (P) in clinker and calculate phosphorus apportionment ratio, determine fluxing agent
Amount.At this point, cold recycling can also be implemented with the decarburization clinker of institute's deslagging.In addition, in the case where unreal applying heat recycles,
By decarburization clinker whole deslagging, in next furnace charge, decarburization blowing is carried out using only black furnace slag and fluxing agent.In addition, also may be used
To carry out decarburization blowing using only fluxing agent in next furnace charge.
It should be noted that in order to generate black furnace slag, (the P in clinker2O5) (quality %) be specified value below situation
Under, unreal applying heat it can also recycle in a part of furnace charge and implement cold recycling.
According to the above, the recirculation volume that can expand decarburization clinker in decarbonizing furnace, can be greatly reduced new input
Fluxing dosage.
Embodiment
Hereinafter, illustrated to the embodiment of the present invention, but the condition in embodiment be can be real in order to confirm the present invention
The property applied and effect and the condition example used, the present invention is not limited to a condition examples.As long as not departing from the present invention's
Reach the purpose of the present invention in the case of purport, then various conditions can be used in the present invention.
In order to confirm the effect of the present invention, the iron that phosphorus concentration is less than to 0.060 mass % has been carried out in Examples 1 to 4
Liquid carries out the operation of decarburization blowing in decarbonizing furnace.Used iron liquid is to have carried out the dephosphorization iron liquid 280 of iron liquid dephosphorization treatment
~290t includes in the ingredient of iron liquid:[C]=3.3~3.8 mass %, [Si]≤ 0.01 mass %, [Mn]=0.10~
0.30 mass %, [P]=0.010 mass % is less than 0.060 mass %.
Decarburization blowing is with by [P]What=0.018% steel grade for being set as the upper limit of product specifications was implemented as object.It needs
It is noted that consider the deviation of rephosphorization etc. from clinker after double refining, it will be from the molten steel tapped in decarbonizing furnace
[P]≤ 0.015% range more preferably is set.For decarburization clinker, crossed with the water described in non-patent literature 1
Phosphor partition ratio is set as 30~60 range by formula, uses the fluxing agents such as quick lime, dolomite, silica, peridotite, black furnace slag
And hot stove slag has carried out decarburization blowing.
Firstly, for black furnace slag, in advance in another furnace charge, after decarbonizing furnace clinker is carried out deslagging and is cooled down, implement magnetic
Choosing is carried out after being crushed with crusher, crosses the sieve of 25mm diameters, for sieving above, returned again to crusher and be crushed,
It is sieved again.Then, under sieve, steel-making factory is carried to as black furnace slag.By being averaged for the black furnace slag of steel-making factory receiving
Grain size is 10mm.
In this furnace charge, the black furnace slag manufactured like this is put into specified amount from the stove elevating hopper of converter via feeding groove
To decarbonizing furnace.Reduction of the effect by fluxing agent and the [ from the molten steel tapped in decarbonizing furnace of the present invention;P]This two
A index is evaluated.It should be noted that implementation ratio described below is to implement the furnace charge of recycling relative to complete
The ratio of portion's furnace charge.For no furnace charge for implementing recycling, the feelings in addition to that could judge and be set as "No" according to recycling
Other than condition, also include because in other operations will be because without the furnace charge of implementation.
(embodiment 1 (example 1))
First, as hot stove slag, not by the complete deslagging of decarbonizing furnace clinker of previous furnace charge, and about 15kg/t is made to remain in
In decarbonizing furnace;As black furnace slag, by the decarbonizing furnace clinker for having carried out granularity adjustment as described above from being set on decarbonizing furnace
Feeding groove puts into 10kg/t.In addition, quick lime, dolomite, silica, peridotite have been put into together with black furnace slag as fluxing agent,
Coolant of the oxide skin of 7kg/t or so as temperature adjustment is put into.It, will be above-mentioned after input black furnace slag and fluxing agent
280~290t of dephosphorization iron liquid be encased in decarbonizing furnace, implement decarburization blowing.In addition, in hot stove slag and black furnace slag,
(CaO)=42 mass %, (SiO2The mass % of)=11.At this stage, the fluxing agent for being equivalent to following amounts is reduced:
CaO:(hot stove slag+black furnace slag) (kg/t) × 0.42
SiO2:(hot stove slag+black furnace slag) (kg/t) × 0.11.
In addition, before the decarburization blowing of this furnace charge or in decarburization blowing, this is calculated by above-mentioned formula (1)~(3)
(P in the clinker of secondary furnace charge2O5) concentration.Then, after decarburization blowing, molten steel is tapped, (the P in clinker2O5) (matter
Measure %) in the case that calculating reaches 2.5 mass % or more, implement the complete deslagging of decarburization the clinker, (P in clinker2O5)
In the case that (quality %) is less than 2.5 mass %, without complete deslagging in such a way that hot stove slag becomes 15kg/t or so
Decarburization clinker a small amount of deslagging has been subjected to.It should be noted that in the case of complete deslagging, in next furnace charge, it is used only
Black furnace slag and fluxing agent have carried out decarburization blowing using only fluxing agent.
Then, 200 furnace charge parts have been repeated in above such operation.As a result, ratio is implemented in heat recycling
Furnace charge number ÷ total furnace charge numbers are implemented in the recycling of (=heat) reach 61%, ratio (=cold recycling implementation furnace charge is implemented in cold recycling
The total furnace charge numbers of number ÷) reach 98%.
(embodiment 2 (example 2))
First, as hot stove slag, not by the complete deslagging of decarbonizing furnace clinker of previous furnace charge, and about 15kg/t is made to remain in
In decarbonizing furnace;As black furnace slag, by the decarbonizing furnace clinker for having carried out granularity adjustment as described above from being set on decarbonizing furnace
Feeding groove puts into 10kg/t.In addition, quick lime, dolomite, silica, peridotite have been put into together with black furnace slag as fluxing agent,
Coolant of the oxide skin of 7kg/t or so as temperature adjustment is put into.It, will be above-mentioned after input black furnace slag and fluxing agent
280~290t of dephosphorization iron liquid be encased in decarbonizing furnace, implement decarburization blowing.In addition, in hot stove slag and black furnace slag,
(CaO)=42 mass %, (SiO2The mass % of)=11.At this stage, the fluxing agent for being equivalent to following amounts is reduced:
CaO:(hot stove slag+black furnace slag) (kg/t) × 0.42
SiO2:(hot stove slag+black furnace slag) (kg/t) × 0.11.
In addition, after decarburization blowing, molten steel is tapped, does not consider that the heat recycling to next furnace charge could be implemented,
And decarburization clinker is subjected to a small amount of deslagging in such a way that hot stove slag becomes 15kg/t or so and is followed again to continuously implement heat
Ring.Then, 200 furnace charges have been repeated in above such operation.Reach as a result, ratio is implemented in heat recycling
82%, cold recycling implements ratio and reaches 98%.
(embodiment 3 (previous example 1))
First, as hot stove slag, not by the complete deslagging of decarbonizing furnace clinker of previous furnace charge, and about 15kg/t is made to remain in
In decarbonizing furnace, quick lime, dolomite, silica, peridotite have been put into as fluxing agent, the oxide skin for having put into 7kg/t or so is made
For the coolant of temperature adjustment.It should be noted that not putting into black furnace slag.After putting into fluxing agent, above-mentioned is taken off
280~290t of ferrophosphorus liquid is encased in decarbonizing furnace, implements decarburization blowing.In addition, in hot stove slag, (CaO)=42 mass %,
(SiO2The mass % of)=11.At this stage, the fluxing agent for being equivalent to following amounts is reduced:
CaO:Hot stove slag (kg/t) × 0.42
SiO2:Hot stove slag (kg/t) × 0.11.
In addition, after decarburization blowing, molten steel is tapped, does not consider that the heat recycling to next furnace charge could be implemented,
And decarburization clinker is subjected to a small amount of deslagging in such a way that hot stove slag becomes 15kg/t or so and is followed again to continuously implement heat
Ring.Then, 200 furnace charges have been repeated in above such operation.Reach as a result, ratio is implemented in heat recycling
72%.It is low-level that heat recycling, which implements ratio compared with Example 2, this is because:Due to not implementing cold recycling,
The solidification of hot stove slag is needed into the time, under the times such as the shorter situation in furnace charge interval not abundant situation, decarburization clinker is carried out
Complete deslagging.
(embodiment 4 (previous example 2))
Do not implement heat recycling and by the complete deslagging of decarburization clinker in previous furnace charge, by above-mentioned dephosphorization iron liquid 280
~290t is encased in decarbonizing furnace, implements decarburization blowing.Then, it is thrown within 5 minutes since blowing to promote fusing
Enter the above-mentioned black furnace slag of 10kg/t, and put into quick lime, dolomite, silica, peridotite as fluxing agent, puts into 7kg/t
Coolant of the oxide skin of left and right as temperature adjustment.In addition, in black furnace slag, (CaO)=42 mass %, (SiO2)=
11 mass %.At this stage, the fluxing agent for being equivalent to following amounts is reduced:
CaO:Black furnace slag (kg/t) × 0.42
SiO2:Black furnace slag (kg/t) × 0.11.
Then, after decarburization blowing, molten steel is tapped, the complete deslagging of decarburization clinker is implemented.It will be above such
Operation 200 furnace charges have been repeated.As a result, ratio is implemented in cold recycling reaches 65%, ratio is implemented in cold recycling
It is comparably low-level with embodiment 1 and 2.If unreal applying heat recycles and puts into black furnace slag before filling iron liquid, in iron
When the filling of liquid, larger bumping reaction is will produce due to the meal component and the moisture that are attached on vessel slag.Therefore, implementing
In example 4, start after five minutes to put into black furnace slag in converter in blowing.The situation also can generate bumping when black furnace slag is put into
Reaction, but it is smaller compared with reaction the case where being put into before filling iron liquid.But, it is known that:Just in the rainy day, conveyance includes water
For the case where black furnace slag divided etc., due to including many moisture in black furnace slag, reacting notable, therefore, it is difficult to steadily use,
Recirculation volume is only unable to ensure by cold recycling.
(embodiment 5 (example 3))
It has been carried out in embodiment 5 by phosphorus concentration being that 0.035 mass % iron liquids below carry out decarburization in decarbonizing furnace and blow
The operation of refining.Used iron liquid is to have carried out dephosphorization 280~290t of iron liquid of iron liquid dephosphorization treatment, is wrapped in the ingredient of iron liquid
Contain:[C]=3.3~3.8 mass %, [Si]≤ 0.01 mass %, [Mn]=0.10~0.30 mass %, [P]=0.010~
0.035 mass %.
First, as hot stove slag, not by the complete deslagging of decarbonizing furnace clinker of previous furnace charge, and about 22kg/t is made to remain in
In decarbonizing furnace, as black furnace slag, by the decarbonizing furnace clinker for having carried out granularity adjustment as described above from being set on decarbonizing furnace
Feeding groove puts into 11kg/t.It is used in addition, the oxide skin for not putting into fluxing agent, and having put into 7kg/t or so is adjusted as temperature
Coolant.After putting into black furnace slag, above-mentioned 280~290t of dephosphorization iron liquid is encased in decarbonizing furnace, decarburization is implemented
Blowing.In addition, in hot stove slag and black furnace slag, (CaO)=42 mass %, (SiO2The mass % of)=11.At this stage, it reduces
It is equivalent to the fluxing agent of following amounts:
CaO:(hot stove slag+black furnace slag) (kg/t) × 0.42
SiO2:(hot stove slag+black furnace slag) (kg/t) × 0.11.
In addition, before the decarburization blowing of this furnace charge or in decarburization blowing, this is calculated by above-mentioned formula (1)~(3)
(P in the clinker of secondary furnace charge2O5) concentration.Then, after decarburization blowing, molten steel is tapped, (the P in clinker2O5) (matter
Measure %) in the case that calculating reaches 2.5 mass % or more, implement the complete deslagging of decarburization the clinker, (P in clinker2O5)
It, will in such a way that hot stove slag becomes 20kg/t or so without complete deslagging in the case that (quality %) is less than 2.5 mass %
Decarburization clinker has carried out a small amount of deslagging.It should be noted that in the case of complete deslagging, in next furnace charge, it is used only cold
Clinker and fluxing agent have carried out decarburization blowing using only fluxing agent.
Then, 50 furnace charge parts have been repeated in above such operation.It is reached as a result, ratio is implemented in heat recycling
To 100%, cold recycling implements ratio and reaches 97%.
(embodiment 6 (previous example 3))
It has been carried out in embodiment 6 by phosphorus concentration being that 0.100 mass % iron liquids below carry out decarburization in decarbonizing furnace and blow
The operation of refining.Used iron liquid is to have carried out dephosphorization 280~290t of iron liquid of iron liquid dephosphorization treatment, is wrapped in the ingredient of iron liquid
Contain:[C]=3.3~3.8 mass %, [Si]≤ 0.01 mass %, [Mn]=0.10~0.30 mass %, [P]=0.060~
0.100 mass %.
First, as hot stove slag, not by the complete deslagging of decarbonizing furnace clinker of previous furnace charge, and about 15kg/t is made to remain in
In decarbonizing furnace, as black furnace slag, by the decarbonizing furnace clinker for having carried out granularity adjustment as described above from being set on decarbonizing furnace
Feeding groove puts into 10kg/t.In addition, putting into quick lime, dolomite, silica, peridotite together with black furnace slag as fluxing agent, throw
Coolant of the oxide skin of 7kg/t or so as temperature adjustment is entered.It, will be above-mentioned after input black furnace slag and fluxing agent
280~290t of dephosphorization iron liquid is encased in decarbonizing furnace, implements decarburization blowing.In addition, in hot stove slag and black furnace slag, (CaO)
=42 mass %, (SiO2The mass % of)=11.At this stage, the fluxing agent for being equivalent to following amounts is reduced:
CaO:(hot stove slag+black furnace slag) (kg/t) × 0.42
SiO2:(hot stove slag+black furnace slag) (kg/t) × 0.11.
In addition, before the decarburization blowing of this furnace charge or in decarburization blowing, this is calculated by above-mentioned formula (1)~(3)
(P in the clinker of secondary furnace charge2O5) concentration.Then, after decarburization blowing, molten steel is tapped, (the P in clinker2O5) (matter
Measure %) in the case that calculating reaches 2.5 mass % or more, implement the complete deslagging of decarburization the clinker, (P in clinker2O5)
In the case that (quality %) is less than 2.5 mass %, without complete deslagging in such a way that hot stove slag becomes 15kg/t or so
Decarburization clinker a small amount of deslagging has been subjected to.It should be noted that in the case of complete deslagging, in next furnace charge, it is used only
Black furnace slag and fluxing agent have carried out decarburization blowing using only fluxing agent.
Then, 50 furnace charge parts have been repeated in above such operation.It is reached as a result, ratio is implemented in heat recycling
To 20%, cold recycling implements ratio and reaches 40%.
(comparative example)
Do not implement heat recycling and by the complete deslagging of decarburization clinker in previous furnace charge, by above-mentioned dephosphorization iron liquid 280
~290t is encased in decarbonizing furnace, implements decarburization blowing.Then, quick lime, dolomite, silica, peridotite is put into be used as and help
Flux has put into coolant of the oxide skin of 7kg/t or so as temperature adjustment.After decarburization blowing, molten steel is carried out
Tapping, implements the complete deslagging of decarburization clinker.200 furnace charges have been repeated in above such operation.
(experimental result)
Fig. 1 is the detailed figure for the composition for indicating the decarburization clinker in Examples 1 to 4 and comparative example.In addition, as in Fig. 1
As shown, decarburization clinker is by hot stove slag, black furnace slag, fluxing agent (this furnace charge clinker) and leaves clinker and constitutes.Any feelings
Under condition, total amount is all 38kg/t or so, and it is 5.3kg/t to leave clinker all.Therefore, be recycled clinker (hot stove slag and
Black furnace slag) amount can be evaluated as cut down fall fluxing agent amount.
In addition, in Fig. 1, the value of hot stove slag and black furnace slag is that the input amount in each embodiment is multiplied by and implements ratio and obtain
Value.It is like this example of the present invention by the embodiment 1 and 2 of cold recycling and heat recycling, can further cuts down new throwing
The fluxing dosage entered.(the P especially in being not dependent on clinker2O5) (quality %) and implement heat recycling embodiment 2 in,
New fluxing dosage reaches floor level.The reduction of fluxing agent becomes following result:Embodiment 2 is maximum, is 22.1kg/t, real
It applies example 1 to take second place, is 19.0kg/t.In addition, for as the embodiment 3 of previous example and 4, become following result:New is fluxing
The reduction of agent is few.
Fig. 2 is to indicate the [ from the molten steel tapped in the decarbonizing furnace in Examples 1 to 4 and comparative example;P]Figure.Implementing
In example 1~4 and comparative example, all become the upper limit, that is, [ than product specifications in whole furnace charges;P]=0.018 mass % is small
Value.
For comparative example, due to not having to carry out the recycling of clinker, all having used fluxing agent, in molten steel
[P]For low-level.
For embodiment 1, [ in molten steel;P]It is comparably low-level with comparative example 1.It is believed that this is because:With it is new
The fluxing agent of input is compared, and when being recycled to the clinker once melted scorification can improve;In turn, only in clinker
(P2O5) (quality %) become less than hot stove slag is used in the case of 2.5 mass %, dephosphorizing capacity is ensured with this.
For embodiment 2, due to there is no to judge that hot stove slag could recycle, become following result:Although fluxing
The reduction of agent is big, but [ in molten steel;P]Deviation it is big.It should be noted that, although with 2.0% in all 200 furnace charges
Ratio departing from preferred range, that is, [P]The range of≤0.015 mass %, but due to reached than product specifications the upper limit i.e.
[P]Value small=0.018 mass %, therefore confirmed it is what there is no problem on product.
For embodiment 3, due to there is no to judge that hot recycling could be carried out, become following result:In molten steel
[P]Deviation it is big.It should be noted that, although being departing from preferred range with 1.0% ratio in all 200 furnace charges
[P]The range of≤0.015 mass %, but reached the upper limit i.e. [ than product specifications;P]=0.018% small value.
For embodiment 4, due to only implementing cold recycling, it is ensured that dephosphorizing capacity, thus while the reduction of fluxing agent
Amount is few, but [ in molten steel;P]Low-level is reached compared with embodiment 2 and 3.
For embodiment 5, compared with Example 1, [ in molten steel;P]For more low-level.It is believed that this is because:Due to
Only it is that 0.035 mass % iron liquids below have carried out carbonization treatment, therefore (P in hot stove slag with phosphorus concentration2O5) (quality %) protected
It holds in reduced levels.
For embodiment 6, due to carrying out decarburization to the iron liquid that phosphorus concentration is 0.065 mass % or more, in order to true
It protects dephosphorizing capacity and new fluxing agent is made to increase, thus lead to [ in molten steel;P]For low-level.In addition, since judged could
Hot recycling is carried out, therefore deviation is little.
Fig. 3 is the (P indicated in hot stove slag2O5) with tapping after molten steel in [P]Relationship figure.For definite relation,
It has extracted and has eliminated blowing condition ([ in the iron liquid after dephosphorization;P], slag amount, practical basicity and Zhong Dian [C]) influence number
According to.With (the P in hot stove slag2O5) increase, [ in the molten steel after tapping;P]There is also increased tendencies.It is thus regarded that:
In embodiment 2 and 3, [ in the molten steel after tapping;P]Deviation be by (the P in hot stove slag2O5) concentration caused by.
Fig. 4 is the detailed figure for the composition for indicating the decarburization clinker in embodiment 1,5,6, shows that phosphorus concentration is 0.035
Quality % or less, less than the decarburization clinker in 0.060 mass %, 0.100 mass % iron liquids below composition influence.Separately
Outside, as shown in Figure 4, decarburization clinker by hot stove slag, black furnace slag, fluxing agent (this furnace charge clinker) and leaves clinker structure
At.Under either case, total amount is all 38kg/t or so.Therefore, the amount for the clinker (hot stove slag and black furnace slag) being recycled
It can be evaluated as cutting down the amount of the fluxing agent fallen.
In Fig. 4, the value of hot stove slag and black furnace slag is that input amount in each embodiment is multiplied by and implements to be worth obtained from ratio.
It is like this example of the present invention, the fluxing dosage setting that will can newly put by the embodiment 5 of cold recycling and heat recycling
It is zero.
On the other hand, for embodiment 6, the fluxing agent amount newly put into becomes maximum, could not cut down the amount of fluxing agent.This
Be due to:(the P being predicted to be in decarburization clinker2O5) high furnace charge is more, the implementation ratio of heat recycling greatly declines.
According to the above results, for the embodiment 1,2 and 5 as example of the present invention, due to being followed again by heat appropriate
The combination of ring and cold recycling so that hot stove slag is cured by black furnace slag, and the moisture in black furnace slag is removed by hot stove slag, therefore can
Mitigate the project of the two.Recirculation volume expands as a result, therefore can reduce the fluxing agent newly put into, is carried out by decarburization clinker
When recycling, by the improvement effect of the scorification of clinker, it can steadily make molten steel Di [P]Change.
Industrial availability
In accordance with the invention it is possible to the molten steel for the amount that can fully reduce the fluxing agent newly put into decarburization blowing is provided
Manufacturing method, industrial value are very big.
Claims (4)
1. a kind of manufacturing method of molten steel, which is characterized in that de- making a part for the clinker generated by previous furnace charge remain in
In the state of in carbon stove, in this furnace charge, clinker is thrown obtained from making the clinker solidification generated by past decarburization blowing
Enter into the decarbonizing furnace, then, phosphorus concentration is encased in less than the iron liquid of 0.060 mass % in the decarbonizing furnace and is taken off
Carbon blows.
2. the manufacturing method of molten steel according to claim 1, which is characterized in that being blown by decarburization in this furnace charge is given birth to
At clinker in P2O5A concentration of specified value it is below in the case of, by a part remain in the decarbonizing furnace as next time
The clinker used in furnace charge.
3. the manufacturing method of molten steel according to claim 1 or 2, which is characterized in that in this furnace charge, by the solidification
Obtained from clinker put into the decarbonizing furnace, and put into fluxing agent,
Wherein, the amount of the fluxing agent is based on the P in the clinker generated by previous furnace charge2O5Concentration determine.
4. the manufacturing method of molten steel described in any one of claim 1 to 3, which is characterized in that the solidification obtains
Clinker grain size be 50mm or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2016-147313 | 2016-07-27 | ||
| JP2016147313 | 2016-07-27 | ||
| PCT/JP2017/025296 WO2018021019A1 (en) | 2016-07-27 | 2017-07-11 | Molten steel production method |
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| JP (1) | JP6798554B2 (en) |
| KR (1) | KR102234126B1 (en) |
| CN (1) | CN108699613A (en) |
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| CN115348955A (en) * | 2020-03-18 | 2022-11-15 | 杰富意钢铁株式会社 | Method for producing slag product and slag product |
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| JP7243185B2 (en) * | 2018-12-27 | 2023-03-22 | 日本製鉄株式会社 | Hot slag recycling method |
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| JP2607328Y2 (en) | 1993-11-12 | 2001-07-09 | 株式会社シマノ | Rear derailleur for bicycle |
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| JP5671801B2 (en) | 2010-01-13 | 2015-02-18 | 新日鐵住金株式会社 | Converter refining method |
| CN102747181B (en) * | 2011-04-18 | 2015-01-07 | 宝山钢铁股份有限公司 | Smelting method of 9Ni steel |
| JP6136379B2 (en) * | 2013-03-05 | 2017-05-31 | 新日鐵住金株式会社 | Molten steel manufacturing method |
| CN103614508B (en) * | 2013-12-10 | 2015-02-25 | 首钢总公司 | Method for smelting high-titanium liquid iron by utilizing converter |
| JP6347174B2 (en) * | 2014-08-05 | 2018-06-27 | 新日鐵住金株式会社 | Converter operation method using dephosphorized pretreatment hot metal. |
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2017
- 2017-07-11 WO PCT/JP2017/025296 patent/WO2018021019A1/en active Application Filing
- 2017-07-11 CN CN201780013618.3A patent/CN108699613A/en active Pending
- 2017-07-11 JP JP2018529495A patent/JP6798554B2/en active Active
- 2017-07-11 KR KR1020187022682A patent/KR102234126B1/en active IP Right Grant
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| JP2008280572A (en) * | 2007-05-09 | 2008-11-20 | Nippon Steel Corp | Method for blow-refining molten steel |
| CN102212640A (en) * | 2011-06-01 | 2011-10-12 | 首钢总公司 | Convertor steelmaking method capable of reducing slag quantity |
| CN104769136A (en) * | 2012-10-30 | 2015-07-08 | 杰富意钢铁株式会社 | Refine method of hot metal |
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| CN115348955B (en) * | 2020-03-18 | 2023-10-13 | 杰富意钢铁株式会社 | Method for producing slag product and slag product |
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| KR20180099878A (en) | 2018-09-05 |
| TW201812025A (en) | 2018-04-01 |
| WO2018021019A1 (en) | 2018-02-01 |
| KR102234126B1 (en) | 2021-04-01 |
| JP6798554B2 (en) | 2020-12-09 |
| TWI637062B (en) | 2018-10-01 |
| JPWO2018021019A1 (en) | 2018-11-01 |
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